Industrial electric heating furnaces – Plasma furnace device – Direct furnace
Patent
1986-07-30
1987-09-15
Envall, Jr., Roy N.
Industrial electric heating furnaces
Plasma furnace device
Direct furnace
373 25, H05H 100, H05B 700
Patent
active
046944648
ABSTRACT:
An apparatus and method for heating a metallic melt with plasma torches is disclosed which is characterized by its ability to reduce the amount of contamination that is introduced into the metallic melt during the heating process. The apparatus and method includes a furnace chamber having a hearth for receiving a metallic melt. Mounted to the furnace chamber are a pair of plasma torches and an external electrode that is adapted to contact the metallic melt contained in the hearth. A separate direct current power supply is provided to operate such plasma torch. During operation of the apparatus, two separate circuits of opposite polarity are established through the metallic melt utilizing the plasma torches and the external electrode in contact with the melt. While these circuits are maintained, the external electrode is withdrawn from contact with the melt, thereby establishing a single series circuit which includes both plasma torches, both power supplies and the metallic melt.
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Envall Jr. Roy N.
Plasma Energy Corporation
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